Siding · Fiber cement siding
How long does fiber cement siding last?
InterNACHI's baseline chart puts fiber cement siding at 100+ years, which is longer than the product has been in American walls — it arrived here in the late 1980s, so nobody has watched one finish. What can be read today is the paper, and James Hardie's 30-year term is one of the few in building products that genuinely carries no proration schedule. It also pays nothing toward labor, in capital letters.
Updated
The gap: warranty ends at 30 years; typical service life ends around 100+ years. The material typically outruns the paper by about 90 years. Warranty document (James Hardie, checked 2026-08-27)
Typical service life: 100+ years
The chart's entry is "100+" with no upper figure, on a chart that carries no date of its own; the 120 here only bounds the drawing. Hold it lightly: fiber cement siding has been sold in North America only since the late 1980s, so the century is an estimate about the material, not an observation of a wall.
Tier 3 · baseline chart (undated) Range from InterNACHI — Standard Estimated Life Expectancy Chart for Homes, checked 2026-08-27.
This is the one siding here whose maker sells two different products by climate: an HZ5 board engineered for freeze-thaw and an HZ10 board for hot, humid and coastal service, each with its own warranty document and its own map. The board on a given wall is warranted only inside its own zone. Climate is not a footnote on this number — it decides which piece of paper applies.
What the warranty paper actually says
James Hardie (Hardie Plank HZ10 lap siding and related HZ10 products — 30-Year Express Limited Product Warranty) publishes a 30-year limited, non-prorated, transferable, conditional warranty. The thirty years really do carry no proration schedule — a claim in year 29 is worth what a claim in year 2 is worth, up to twice the original retail cost of the defective portion. What the term will not do is pay for the work: the document states in capitals that James Hardie will not refund or pay any costs in connection with labor or accessory materials, so the remedy is boards, not a re-sided house. It reaches the first retail purchaser, the first owner of the structure and one transferee after that. It applies only inside the HZ10 zone — the Gulf and Southeast states plus listed ZIP codes elsewhere, with colder states running on a separate HZ5 document — and a claim must be in writing within 90 days of discovering the defect and before any permanent repair. The factory ColorPlus finish is a separate 15-year term that shrinks 6.67% a year after the first year.
The warranty document itself , checked 2026-08-27.
What shortens it
- Ground and splash contact — the boards are meant to hold a clearance above grade, roofs and decks, and they wick water where that clearance was closed up
- Unsealed field cuts and unprimed edges, which drink water at every butt joint
- Caulk joints left to open, since the sealant at trim and butt joints runs on a far shorter clock than the board
- Sprinklers throwing water at the same stretch of wall every morning
- The hot-climate product installed in a freeze-thaw region, or the reverse — the maker splits the line into two climate zones for a reason
Signs of wear to look for
- Swelling, softening or crumbling at the bottom edge of boards nearest grade and at butt joints
- Caulk pulled away from trim, corners and joints, leaving gaps that stay open in the wet season
- Factory finish or field paint peeling in sheets rather than chalking evenly across the wall
- Efflorescence — a white powdery bloom — on the face of the boards
- Hairline cracks radiating from nail heads, or nails driven through the face and standing proud
Water that got past the boards and reached the sheathing or framing behind them shows up as soft spots, stains appearing inside, or trim that will no longer hold a fastener — that is an inspection question, not a web-page question.
Other siding materials
- Vinyl siding 50+ yrs
- Engineered wood siding 100+ yrs
- Wood siding 100+ yrs
- Aluminum siding 25+ yrs
- Brick veneer 150+ yrs
- Stucco 50–100 yrs
- Manufactured stone veneer 100+ yrs